sectored disk

noun

sec·​tored disk

ˈsektə(r)d-

variants or less commonly sector disk or sector wheel

: a disk with alternate opaque and open sectors used in photometers to vary the brightness in a known manner

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now